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with medians as (
  select TagName, 
         -- http://stackoverflow.com/a/8846679/1438
         PERCENTILE_DISC(0.5) 
                  WITHIN GROUP (ORDER BY ViewCount)
                  OVER (PARTITION BY TagName)
               median_views,
               
         PERCENTILE_DISC(0.5) 
                  WITHIN GROUP (ORDER BY AnswerCount)
                  OVER (PARTITION BY TagName)
               median_answers,
               
         PERCENTILE_DISC(0.5) 
                  WITHIN GROUP (ORDER BY Score)
                  OVER (PARTITION BY TagName)
               median_score
  from Posts p
       join PostTags on p.Id = PostId
       join Tags t on t.Id = TagId
  where PostTypeId = 1
        and TagName in (##tag##)
),

counts as (
  select TagName, ViewCount,
         AnswerCount,
         Score,
         AcceptedAnswerId accepted,
         ClosedDate closed
  from Posts p
       join PostTags on p.Id = PostId
       join Tags t on t.Id = TagId
  where PostTypeId = 1
        and TagName in (##tag##)
)

select m.TagName, count(*) N, 
       median_views,
       round(avg(1.0*Score), 1) avg_score,
       round(100.0*count(closed)/count(*), 1) closed_rate,
       round(avg(1.0*AnswerCount), 1) avg_answers,
       round(100.0*count(accepted)/count(*), 1) accepted_rate,
       round(100.0*count(case 
                           when AnswerCount > 0 then 1 
                         end)/count(*), 1) answer_rate

from medians m
     join counts c on c.TagName = m.TagName
group by m.TagName, median_views
order by m.TagName

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